Index: openacs-4/packages/bug-tracker/www/related-file-properties.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/bug-tracker/www/related-file-properties.tcl,v
diff -u -r1.1 -r1.2
--- openacs-4/packages/bug-tracker/www/related-file-properties.tcl	30 May 2008 13:46:05 -0000	1.1
+++ openacs-4/packages/bug-tracker/www/related-file-properties.tcl	14 Oct 2013 18:14:22 -0000	1.2
@@ -23,7 +23,7 @@
     ad_script_abort
 }
 
-if {![exists_and_not_null return_url]} {
+if {(![info exists return_url] || $return_url eq "")} {
     set return_url [export_vars -base "bug" {bug_number}]
 }